Forced arc isolation device and circuit breaker
By setting up a forced arc isolation device between the arc extinguishing chamber of the circuit breaker and the moving contact, and using the torsion spring mechanism to force arc isolation when the dynamic and static contacts are separated, the problem of difficulty in extinguishing the arc under high current in the prior art is solved, and the rapid disconnection and effective arc extinguishing of the arc are achieved.
Patent Information
- Application Number
- CN202420604629.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The existing arc extinguishing device is difficult to effectively extinguish the arc when facing high currents, resulting in failure of breaking, burning of the arc chamber and inability to extinguish the arc.
A forced arc isolation device is designed, by providing a first arc isolation plate and a second arc isolation plate between the moving contact and the arc extinguishing chamber, and using the first torsion spring and the second torsion spring, the arc isolation plate is forced to be isolated when the dynamic and static contacts are separated, and the arc isolation plate is disconnected.
Forced arc isolation when the dynamic and static contacts are separated is realized, so that the arc can be disconnected quickly, thereby effectively extinguishing the arc, solving the problem of insufficient arc extinguishing ability in the prior art.
Smart Images
Figure CN222785247U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a forced arc isolation device. Background Art
[0002] The circuit breaker controls the opening and closing of the circuit by forming a contact system with a moving contact and a stationary contact. The moving contact is connected to the operating mechanism through a connecting rod. The moving contact and the rotating shaft are controlled by the operating mechanism to rotate. When the moving contact and the stationary contact are closed, the product is in a live state. Therefore, when a large current appears in the system, the moving contact is lifted up due to the action of the mechanism, and the stationary contact is flipped downward due to the action of the electric repulsion, overcoming the torsion of the torsion spring, and the moving and stationary contacts are completely separated. When the moving and stationary contacts are separated, because they are in a live state, the moving and stationary contacts are separated due to the existence of electricity. Potential difference, the air in the electrode gap is ionized due to strong heat, the electric field strength of the cathode is much greater than that of the anode and arc column area, that is, the voltage of the cathode area is higher than that of the anode area, it can provide electrons to the arc area, thereby generating a large number of high-speed electrons on the cathode plate, colliding with molecules and atoms in the air, and colliding with the electrons in them, generating ions and free electrons. Under the action of the electric field strength, cations collide with the cathode, and anions and free electrons collide with the anode. As a result of this strong collision, high temperature and heat are generated in the electrode, accompanied by the emission of strong light, generating an arc. The circuit breaker uses an arc extinguishing hood to accelerate the extinguishing of the arc. As the breaking current of the circuit breaker becomes higher and higher, higher and higher requirements are also put forward for the arc extinguishing ability of the circuit breaker.
[0003] The existing arc extinguishing devices are difficult to extinguish arcs with large currents, and are often prone to breaking failure, arc extinguishing chamber burning out, and arc failure to extinguish, so a new structure is needed to solve these problems.
[0004] Therefore, the utility model needs to provide a forced arc isolation device which has good arc extinguishing effect and can timely interrupt the arc. Utility Model Content
[0005] The purpose of the utility model is to provide an arc extinguishing system, so as to solve the above-mentioned problems existing in the prior art.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0007] A forced arc isolation device, comprising a first arc isolation plate and a second arc isolation plate, wherein the first arc isolation plate and the second arc isolation plate are arranged between a moving contact and an arc extinguishing chamber, and the upper ends of the first arc isolation plate and the second arc isolation plate are rotatably mounted on the arc extinguishing chamber through a first fixed shaft and a second fixed shaft;
[0008] It also includes a first torsion spring and a second torsion spring, the upper end of the first torsion spring is sleeved on the first fixed shaft, the upper end of the second torsion spring is sleeved on the second fixed shaft, the lower ends of the first torsion spring and the second torsion spring are in contact with the first arc isolation plate and the second arc isolation plate respectively, and the first torsion spring and the second torsion spring are subjected to force to close the first arc isolation plate and the second arc isolation plate toward the ends close to each other or separate toward the ends far away from each other.
[0009] Furthermore, the first arc isolation plate and the second arc isolation plate are also provided with a first limit block and a second limit block, the end of the first torsion spring away from the first fixed axis can be contacted with the first limit block, and the end of the second torsion spring away from the second fixed axis can be contacted with the second limit block, the first limit block and the second limit block are located on the outer surfaces of the first arc isolation plate and the second arc isolation plate away from each other, and the first limit block and the second limit block are used to limit the first torsion spring and the second torsion spring.
[0010] Furthermore, the first arc isolation plate and the second arc isolation plate are of relative sizes and the same shape.
[0011] Furthermore, the first limiting block and the second limiting block are equal in size and have the same shape.
[0012] Furthermore, the first fixed shaft and the second fixed shaft are respectively fixed on the first gas producing part and the second gas producing part of the arc extinguishing chamber.
[0013] Furthermore, a first slot body and a second slot body are provided at positions corresponding to the first arc isolation plate and the second arc isolation plate on the first gas producing part and the second gas producing part, and the height of the first slot body and the second slot body is higher than that of the first arc isolation plate and the second arc isolation plate.
[0014] Furthermore, the rotation angle of the first arc isolation plate and the second arc isolation plate is 10-25°.
[0015] The utility model also includes a circuit breaker, and the circuit breaker includes the above-mentioned forced arc isolation device.
[0016] The beneficial effects of the utility model are:
[0017] The utility model provides an arc isolation device between the arc extinguishing chamber and the moving contact. When the moving and static contacts are opened, the arc isolation device can forcibly isolate the arc to disconnect the arc, thereby effectively extinguishing the arc. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a diagram of the forced arc isolation device of the utility model in the open state;
[0019] Figure 2This is a diagram of the closed state of the forced arc isolation device of the utility model;
[0020] Figure 3 It is a structural schematic diagram of the utility model of the forced arc isolation device installed on the circuit breaker;
[0021] Figure 4 The utility model is a structural schematic diagram of a forced arc isolation device installed on a circuit breaker.
[0022] Reference numerals:
[0023] The first arc isolation plate 1, the second arc isolation plate 2, the moving contact 3, the arc extinguishing chamber 4, the first fixed shaft 5, the second fixed shaft 6, the first torsion spring 7, the second torsion spring 8, the first limit block 9, the first gas producing part 10, the second gas producing part 11, and the first slot body 12. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.
[0025] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0027] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0028] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
[0029] like Figures 1 to 4 As shown, a forced arc isolation device comprises a first arc isolation plate 1 and a second arc isolation plate 2, wherein the first arc isolation plate 1 and the second arc isolation plate 2 are arranged between the moving contact 3 and the arc extinguishing chamber 4, and the upper ends of the first arc isolation plate 1 and the second arc isolation plate 2 are rotatably mounted on the arc extinguishing chamber 4 through a first fixed shaft 5 and a second fixed shaft 6;
[0030] It also includes a first torsion spring 7 and a second torsion spring 8, the upper end of the first torsion spring 7 is sleeved on the first fixed shaft 5, and the upper end of the second torsion spring 8 is sleeved on the second fixed shaft 6, the lower ends of the first torsion spring 7 and the second torsion spring 8 are in contact with the first arc isolation plate 1 and the second arc isolation plate 2 respectively, and the first torsion spring 7 and the second torsion spring 8 are subjected to force to make the first arc isolation plate 1 and the second arc isolation plate 2 close to each other or separate to each other.
[0031] It can be known from the above method that since the arc isolating device is provided between the arc extinguishing chamber 4 and the moving contact 3, the arc is forced to be isolated by the arc isolating device, so that the arc is disconnected, thereby effectively extinguishing the arc.
[0032] When the moving and static contacts are in the separated state, the first arc-isolating plate 1 and the second arc-isolating plate 2 receive the force of the respective first torsion springs 7 and second torsion springs 8 to rotate toward the middle, so that the first arc-isolating plate 1 and the second arc-isolating plate 2 are tightly closed. When the static contact and the moving contact 3 are closed, the moving contact moves downward during the process, forcing the first arc-isolating plate 1 and the second arc-isolating plate 2 to rotate and separate. When the moving and static contacts are closed, the first arc-isolating plate 1 and the second arc-isolating plate 2 are adjacent to both sides of the moving contact 3 (not limited to adjacent, can be separated and limited). That is, when the line fault current comes, when the moving and static contacts are separated, the first arc-isolating plate 1 and the second arc-isolating plate 2 are forced to rotate and merge, the arc is isolated, and the arc is quickly extinguished.
[0033] In this embodiment, the first arc isolation plate 1 and the second arc isolation plate 2 are of relative sizes and the same shape. In the actual production process, the size and shape of the first arc isolation plate 1 and the second arc isolation plate 2 can be changed according to actual needs or the structure of the circuit breaker, and there is no specific limitation on the shape and size.
[0034] In addition, it should be noted that the first limit block 9 and the second limit block (not shown) are equal in size and have the same shape. The first limit block 9 and the second limit block are respectively fixed on the first arc isolation plate 1 and the second arc isolation plate 2 by integral molding or welding. In this embodiment, the first limit block 9 and the second limit block are square in shape, and in the actual production process, the shapes of the first limit block and the second limit block can also be set to other shapes, which are not specifically limited.
[0035] In order to firmly fix the first fixed shaft 5 and the second fixed shaft 6, the first fixed shaft 5 and the second fixed shaft 6 are respectively fixed on the first gas producing part 10 and the second gas producing part 11 of the arc extinguishing chamber to ensure that the first fixed shaft and the second fixed shaft can be firmly fixed on the first gas producing part 10 and the second gas producing part 11.
[0036] In addition, it is worth noting that a first slot body 12 and a second slot body are further provided at positions corresponding to the first arc isolation plate 1 and the second arc isolation plate 2 on the first gas producing part 10 and the second gas producing part 11. The heights of the first slot body 12 and the second slot body (not shown) are higher than the heights of the first arc isolation plate 1 and the second arc isolation plate 2, thereby ensuring that the first arc isolation plate 1 and the second arc isolation plate 2 can rotate. When rotating, the rotation angle of the first arc isolation plate and the second arc isolation plate is: 10-25°. In this embodiment, when the first arc isolation plate 1 and the second arc isolation plate 2 rotate 14.2°, the first arc isolation plate 1 and the second arc isolation plate 2 are in close contact with the moving contact, and when the first arc isolation plate 1 and the second arc isolation plate 2 rotate 22.6°, the first arc isolation plate 1 and the second arc isolation plate 2 are merged.
[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.
Claims
1. A forced arc isolation device, characterized in that: The invention comprises a first arc-isolating plate and a second arc-isolating plate, wherein the first arc-isolating plate and the second arc-isolating plate are arranged between the moving contact and the arc-extinguishing chamber, and the upper ends of the first arc-isolating plate and the second arc-isolating plate are rotatably mounted on the arc-extinguishing chamber through a first fixed shaft and a second fixed shaft; It also includes a first torsion spring and a second torsion spring, wherein the upper end of the first torsion spring is sleeved on the first fixed shaft, and the upper end of the second torsion spring is sleeved on the second fixed shaft. When the first torsion spring and the second torsion spring are subjected to force, the first arc isolation plate and the second arc isolation plate are closed toward the ends close to each other or separated toward the ends far away from each other.
2. The forced arc isolation device according to claim 1, characterized in that: The first arc isolation plate and the second arc isolation plate are also provided with a first limit block and a second limit block, one end of the first torsion spring away from the first fixed axis can be contacted with the first limit block, and one end of the second torsion spring away from the second fixed axis can be contacted with the second limit block, the first limit block and the second limit block are located on the outer surfaces of the first arc isolation plate and the second arc isolation plate away from each other, and the first limit block and the second limit block are used to limit the first torsion spring and the second torsion spring.
3. The forced arc isolation device according to claim 1, characterized in that: The first arc isolation plate and the second arc isolation plate are of opposite sizes and have the same shape.
4. The forced arc isolation device according to claim 2, characterized in that: The first limiting block and the second limiting block are equal in size and identical in shape.
5. The forced arc isolation device according to claim 4, characterized in that: The first fixed shaft and the second fixed shaft are respectively fixed to the first gas producing part and the second gas producing part of the arc extinguishing chamber.
6. The forced arc isolation device according to claim 5, characterized in that: The first gas producing part and the second gas producing part are provided with a first slot body and a second slot body at positions corresponding to the first arc isolation plate and the second arc isolation plate. The height of the first slot body and the second slot body is higher than that of the first arc isolation plate and the second arc isolation plate.
7. The forced arc isolation device according to claim 1, characterized in that: The rotation angle of the first arc isolation plate and the second arc isolation plate is 10-25°.
8. A circuit breaker, characterized in that: It comprises the forced arc isolation device as described in any one of claims 1 to 7.